Section 160(1)(a) in The M.P. Motor Vehicles Rules, 1994
(a)Subject to the provisions of Rule 161 passengers may be carried standing on a single deck public service vehicles or on the lower deck of a double decked public service vehicles, if-(i)there is fixed in the roof of the gangway along the vehicle a grabber fixed with hanger straps;(ii)there is a heard room of not less than one hundred and seventy-five centimetres and not more than two hundred centimetres.(iii)there is a clear space serving as a gangway along the vehicle is forty centimetres in width.